Kerker Conditions Upon Lossless, Absorption, and Optical Gain Regimes

Abstract

The directionality and polarization of light show peculiar properties when the scattering by a dielectric sphere can be described exclusively by electric and magnetic dipolar modes. Particularly, when these modes oscillate in-phase with equal amplitude, at the so-called first Kerker condition, the zero optical backscattering condition emerges for non-dissipating spheres. However, the role of absorption and optical gain in the first Kerker condition remains unexplored. In this work, we demonstrate that either absorption or optical gain precludes the first Kerker condition and, hence, the absence of backscattered radiation light, regardless of the size of the particle, incident wavelength, and incoming polarization. Finally, we derive the necessary prerequisites of the second Kerker condition of the zero forward light scattering, finding that optical gain is a compulsory requirement.

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Cited by in corpus (12)

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• Self-hybridisation between interband transitions and Mie modes in dielectric nanoparticles
• Electric and magnetic toroidal dipole excitations in core-shell spheres
• Kerker-Type Positional Disorder Immune Metasurfaces
• Probing the position-dependent optical energy fluence rate in three-dimensional scattering samples
• Gain-assisted optical tweezing of plasmonic and large refractive index microspheres
• On the origin of the Kerker phenomena
• Preservation and destruction of the purity of two-photon states in the interaction with a nanoscatterer
• Gain-controlled directional scattering in core-shell nanoparticles mediated by magnetic toroidal dipoles